Hi,

thanks for the hints. I've looked into newlib and picolib but found no way to do it since the functions used in the Zephyr tests `tzset()` and `setenv()` are not supported by Zephyr according to the documentation https://docs.zephyrproject.org/3.2.0/services/portability/posix.html .

So I kept researching and found another solution (in case anybody else faces the same problem): the Micro Time Zone Library https://github.com/josmithua/utz .

Best regards